i was using some 5-2-1 all thru vegging, usually feeding with every other watering. started at about 1/8 strength and gradually worked up to full strength. also been supplementing with calmag every now and then. i tested the ph runoff the other day and it was between 4-5. i'm gonna try and lay off any nutes for at least a week, and i'll also try letting my tap water sit out for a day or two before i water.